Dùng trục quay để kéo một thùng nước từ giếng sâu 8m. Nếu thùng nước chuyển động thẳng đều đi lên thì dây có thể chịu được thùng nước có khối lượng lớn nhất 20kg.Để thunngf ước đi lên nhanh dần đều và sau thồi gian 4s lên đến mặt đất thì khối lượng thùng nước chỉ có thể lớn nhất bằng bao nhiêu?Lấy g=9,8m/s^2
Answers: 1
Physics, 22.06.2019 01:10
Aparticle initially moving east with a speed of 20.0 m/s, experiences an acceleration of 3.95 m/s, north for a time of 8.00 s. what was the speed of the particle after this acceleration, in units of m/s? give the answer as a positive number.
Answers: 1
Physics, 22.06.2019 18:20
Object a has a length of 3 cm, a width of 2 cm, and a height of 4 cm. object b is dropped into a graduated cylinder. it displaces 19 ml of water. the volume of object a is: a: greater than the volume of object b b: less than the volume of object b c: equal to the volume of object b
Answers: 2
Physics, 22.06.2019 22:30
An alarm clock has a current of 4.5 amps and a resistance of 3.2 ohms. what is the voltage in the circuit? a.1.4 volts b.0.71 volts c.14 volts d.46 volts
Answers: 2
Physics, 23.06.2019 07:30
Aboat travels at 15 m/s in a direction 45° east of north. the boat then turns and travels at 18 m/s in a direction 5° north of east. what is the magnitude of the boat's resultant velocity? round your answer to the nearest whole number. /s what is the direction of the boat's resultant velocity? round your answer to the nearest whole degree. ° north of east
Answers: 1
Dùng trục quay để kéo một thùng nước từ giếng sâu 8m. Nếu thùng nước chuyển động thẳng đều đi lên th...
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